Why did 2 syringes of juvederm in my lips almost completely go away in 5 weeks? (Photos)

Your presentation is quite uncommon. Juvederm usually lasts from 9-12 months depending on the area. It may last a bit less in the lips because the lips are rarely at rest except when sleeping. They are in constant motion with activities such as eating, drinking, talking, smiling, etc. People metabolize Juvederm differently, that's why there's a range as to length of duration. Perhaps in your situation, you got used to your swollen appearance and when it went away, it seemed like you were back to your before appearance? I definitely see a difference - your lips are fuller and you have an overall poutier appearance. They look great! You can use lipstick to enhance the lip look the way Kylie Jenner does. She extends her lipstick beyond the actual border of her augmented lips to give an even fuller appearance. 

Juvederm is a great and long lasting injections for the lips.  Juvederm generally lasts 9 months in a given area.  There may have been swelling that seemed like product and that is why you think it all dissolved.  Please consult an expert for the best cosmetic results. Best, Dr. Green